Update windows job to use SWIG 4.2.1

Author: juan-g-bonilla

.github/workflows/pull-request.yml

@@ -186,6 +186,16 @@ jobs:
 #      - name: "Install swig and cmake"
 #        shell: pwsh
 #        run: choco install swig cmake -y
+      - name: "Install SWIG 4.2.1"
+        shell: pwsh
+        run: |
+            $swigDir = "C:\Program Files\SWIG"
+            if (!(Test-Path $swigDir)) {New-Item -ItemType Directory -Path $swigDir | Out-Null}
+            $swigZip = "$swigDir\swigwin-4.2.1.zip"
+            $swigUrl = "https://sourceforge.net/projects/swig/files/swigwin/swigwin-4.2.1/swigwin-4.2.1.zip/download"
+            Start-Process -NoNewWindow -Wait -FilePath "curl.exe" -ArgumentList "-L -o `"$swigZip`" `"$swigUrl`""
+            if (!(Test-Path $swigZip) -or ((Get-Item $swigZip).Length -lt 500KB)) { Write-Host "Download failed or file is corrupted." }
+            Expand-Archive -Path $swigZip -DestinationPath $swigDir -Force
       - name: "Create python virtual env"
         shell: pwsh
         run: python -m venv venv
@@ -194,12 +204,12 @@ jobs:
         run: |
             venv\Scripts\activate
             pip install -r requirements_dev.txt pytest-error-for-skips
-      - name: "Add basilisk and cmake path to env path"
+      - name: "Add basilisk, swig, and cmake path to env path"
         shell: pwsh
         run: |
           $oldpath = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH).path
-          $newpath = “$oldpath;${{ env.GITHUB_WORKSPACE }}\dist3\Basilisk;C:\Program Files\CMake\bin”
-          Set-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH -Value $newPath
+          $newPath = “C:\Program Files\SWIG\swigwin-4.2.1;$oldpath;${{ env.GITHUB_WORKSPACE }}\dist3\Basilisk;C:\Program Files\CMake\bin”
+          echo "PATH=$newPath" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
       - name: "Build basilisk"
         shell: pwsh
         run: |